Enter your data in a single column or row
Click an empty cell where you want the result
Type `=STDEV.S(range)` for a sample standard deviation
Type `=STDEV.P(range)` for a population standard deviation
Replace `range` with your data range, such as `A1:A10`
Press Enter
Use `=STDEV.S(A1:A10)` for sample data
Use `=STDEV.P(A1:A10)` for the full population
In older versions of Excel, use `=STDEV(range)` for sample standard deviation
You can also use the Data Analysis ToolPak if enabled
Go to the Data tab
Select Data Analysis
Choose Descriptive Statistics
Select your input range
Check Summary statistics
Click OK